Loading...
1/*
2 * linux/drivers/mmc/core/mmc_ops.h
3 *
4 * Copyright 2006-2007 Pierre Ossman
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 */
11
12#include <linux/slab.h>
13#include <linux/types.h>
14#include <linux/scatterlist.h>
15
16#include <linux/mmc/host.h>
17#include <linux/mmc/card.h>
18#include <linux/mmc/mmc.h>
19
20#include "core.h"
21#include "mmc_ops.h"
22
23static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
24{
25 int err;
26 struct mmc_command cmd = {0};
27
28 BUG_ON(!host);
29
30 cmd.opcode = MMC_SELECT_CARD;
31
32 if (card) {
33 cmd.arg = card->rca << 16;
34 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
35 } else {
36 cmd.arg = 0;
37 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
38 }
39
40 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
41 if (err)
42 return err;
43
44 return 0;
45}
46
47int mmc_select_card(struct mmc_card *card)
48{
49 BUG_ON(!card);
50
51 return _mmc_select_card(card->host, card);
52}
53
54int mmc_deselect_cards(struct mmc_host *host)
55{
56 return _mmc_select_card(host, NULL);
57}
58
59int mmc_card_sleepawake(struct mmc_host *host, int sleep)
60{
61 struct mmc_command cmd = {0};
62 struct mmc_card *card = host->card;
63 int err;
64
65 if (sleep)
66 mmc_deselect_cards(host);
67
68 cmd.opcode = MMC_SLEEP_AWAKE;
69 cmd.arg = card->rca << 16;
70 if (sleep)
71 cmd.arg |= 1 << 15;
72
73 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
74 err = mmc_wait_for_cmd(host, &cmd, 0);
75 if (err)
76 return err;
77
78 /*
79 * If the host does not wait while the card signals busy, then we will
80 * will have to wait the sleep/awake timeout. Note, we cannot use the
81 * SEND_STATUS command to poll the status because that command (and most
82 * others) is invalid while the card sleeps.
83 */
84 if (!(host->caps & MMC_CAP_WAIT_WHILE_BUSY))
85 mmc_delay(DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000));
86
87 if (!sleep)
88 err = mmc_select_card(card);
89
90 return err;
91}
92
93int mmc_go_idle(struct mmc_host *host)
94{
95 int err;
96 struct mmc_command cmd = {0};
97
98 /*
99 * Non-SPI hosts need to prevent chipselect going active during
100 * GO_IDLE; that would put chips into SPI mode. Remind them of
101 * that in case of hardware that won't pull up DAT3/nCS otherwise.
102 *
103 * SPI hosts ignore ios.chip_select; it's managed according to
104 * rules that must accommodate non-MMC slaves which this layer
105 * won't even know about.
106 */
107 if (!mmc_host_is_spi(host)) {
108 mmc_set_chip_select(host, MMC_CS_HIGH);
109 mmc_delay(1);
110 }
111
112 cmd.opcode = MMC_GO_IDLE_STATE;
113 cmd.arg = 0;
114 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
115
116 err = mmc_wait_for_cmd(host, &cmd, 0);
117
118 mmc_delay(1);
119
120 if (!mmc_host_is_spi(host)) {
121 mmc_set_chip_select(host, MMC_CS_DONTCARE);
122 mmc_delay(1);
123 }
124
125 host->use_spi_crc = 0;
126
127 return err;
128}
129
130int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
131{
132 struct mmc_command cmd = {0};
133 int i, err = 0;
134
135 BUG_ON(!host);
136
137 cmd.opcode = MMC_SEND_OP_COND;
138 cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
139 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
140
141 for (i = 100; i; i--) {
142 err = mmc_wait_for_cmd(host, &cmd, 0);
143 if (err)
144 break;
145
146 /* if we're just probing, do a single pass */
147 if (ocr == 0)
148 break;
149
150 /* otherwise wait until reset completes */
151 if (mmc_host_is_spi(host)) {
152 if (!(cmd.resp[0] & R1_SPI_IDLE))
153 break;
154 } else {
155 if (cmd.resp[0] & MMC_CARD_BUSY)
156 break;
157 }
158
159 err = -ETIMEDOUT;
160
161 mmc_delay(10);
162 }
163
164 if (rocr && !mmc_host_is_spi(host))
165 *rocr = cmd.resp[0];
166
167 return err;
168}
169
170int mmc_all_send_cid(struct mmc_host *host, u32 *cid)
171{
172 int err;
173 struct mmc_command cmd = {0};
174
175 BUG_ON(!host);
176 BUG_ON(!cid);
177
178 cmd.opcode = MMC_ALL_SEND_CID;
179 cmd.arg = 0;
180 cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
181
182 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
183 if (err)
184 return err;
185
186 memcpy(cid, cmd.resp, sizeof(u32) * 4);
187
188 return 0;
189}
190
191int mmc_set_relative_addr(struct mmc_card *card)
192{
193 int err;
194 struct mmc_command cmd = {0};
195
196 BUG_ON(!card);
197 BUG_ON(!card->host);
198
199 cmd.opcode = MMC_SET_RELATIVE_ADDR;
200 cmd.arg = card->rca << 16;
201 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
202
203 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
204 if (err)
205 return err;
206
207 return 0;
208}
209
210static int
211mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
212{
213 int err;
214 struct mmc_command cmd = {0};
215
216 BUG_ON(!host);
217 BUG_ON(!cxd);
218
219 cmd.opcode = opcode;
220 cmd.arg = arg;
221 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
222
223 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
224 if (err)
225 return err;
226
227 memcpy(cxd, cmd.resp, sizeof(u32) * 4);
228
229 return 0;
230}
231
232static int
233mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
234 u32 opcode, void *buf, unsigned len)
235{
236 struct mmc_request mrq = {0};
237 struct mmc_command cmd = {0};
238 struct mmc_data data = {0};
239 struct scatterlist sg;
240 void *data_buf;
241
242 /* dma onto stack is unsafe/nonportable, but callers to this
243 * routine normally provide temporary on-stack buffers ...
244 */
245 data_buf = kmalloc(len, GFP_KERNEL);
246 if (data_buf == NULL)
247 return -ENOMEM;
248
249 mrq.cmd = &cmd;
250 mrq.data = &data;
251
252 cmd.opcode = opcode;
253 cmd.arg = 0;
254
255 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
256 * rely on callers to never use this with "native" calls for reading
257 * CSD or CID. Native versions of those commands use the R2 type,
258 * not R1 plus a data block.
259 */
260 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
261
262 data.blksz = len;
263 data.blocks = 1;
264 data.flags = MMC_DATA_READ;
265 data.sg = &sg;
266 data.sg_len = 1;
267
268 sg_init_one(&sg, data_buf, len);
269
270 if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
271 /*
272 * The spec states that CSR and CID accesses have a timeout
273 * of 64 clock cycles.
274 */
275 data.timeout_ns = 0;
276 data.timeout_clks = 64;
277 } else
278 mmc_set_data_timeout(&data, card);
279
280 mmc_wait_for_req(host, &mrq);
281
282 memcpy(buf, data_buf, len);
283 kfree(data_buf);
284
285 if (cmd.error)
286 return cmd.error;
287 if (data.error)
288 return data.error;
289
290 return 0;
291}
292
293int mmc_send_csd(struct mmc_card *card, u32 *csd)
294{
295 int ret, i;
296
297 if (!mmc_host_is_spi(card->host))
298 return mmc_send_cxd_native(card->host, card->rca << 16,
299 csd, MMC_SEND_CSD);
300
301 ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd, 16);
302 if (ret)
303 return ret;
304
305 for (i = 0;i < 4;i++)
306 csd[i] = be32_to_cpu(csd[i]);
307
308 return 0;
309}
310
311int mmc_send_cid(struct mmc_host *host, u32 *cid)
312{
313 int ret, i;
314
315 if (!mmc_host_is_spi(host)) {
316 if (!host->card)
317 return -EINVAL;
318 return mmc_send_cxd_native(host, host->card->rca << 16,
319 cid, MMC_SEND_CID);
320 }
321
322 ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid, 16);
323 if (ret)
324 return ret;
325
326 for (i = 0;i < 4;i++)
327 cid[i] = be32_to_cpu(cid[i]);
328
329 return 0;
330}
331
332int mmc_send_ext_csd(struct mmc_card *card, u8 *ext_csd)
333{
334 return mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD,
335 ext_csd, 512);
336}
337
338int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
339{
340 struct mmc_command cmd = {0};
341 int err;
342
343 cmd.opcode = MMC_SPI_READ_OCR;
344 cmd.arg = highcap ? (1 << 30) : 0;
345 cmd.flags = MMC_RSP_SPI_R3;
346
347 err = mmc_wait_for_cmd(host, &cmd, 0);
348
349 *ocrp = cmd.resp[1];
350 return err;
351}
352
353int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
354{
355 struct mmc_command cmd = {0};
356 int err;
357
358 cmd.opcode = MMC_SPI_CRC_ON_OFF;
359 cmd.flags = MMC_RSP_SPI_R1;
360 cmd.arg = use_crc;
361
362 err = mmc_wait_for_cmd(host, &cmd, 0);
363 if (!err)
364 host->use_spi_crc = use_crc;
365 return err;
366}
367
368/**
369 * mmc_switch - modify EXT_CSD register
370 * @card: the MMC card associated with the data transfer
371 * @set: cmd set values
372 * @index: EXT_CSD register index
373 * @value: value to program into EXT_CSD register
374 * @timeout_ms: timeout (ms) for operation performed by register write,
375 * timeout of zero implies maximum possible timeout
376 *
377 * Modifies the EXT_CSD register for selected card.
378 */
379int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
380 unsigned int timeout_ms)
381{
382 int err;
383 struct mmc_command cmd = {0};
384 u32 status;
385
386 BUG_ON(!card);
387 BUG_ON(!card->host);
388
389 cmd.opcode = MMC_SWITCH;
390 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
391 (index << 16) |
392 (value << 8) |
393 set;
394 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
395 cmd.cmd_timeout_ms = timeout_ms;
396
397 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
398 if (err)
399 return err;
400
401 /* Must check status to be sure of no errors */
402 do {
403 err = mmc_send_status(card, &status);
404 if (err)
405 return err;
406 if (card->host->caps & MMC_CAP_WAIT_WHILE_BUSY)
407 break;
408 if (mmc_host_is_spi(card->host))
409 break;
410 } while (R1_CURRENT_STATE(status) == R1_STATE_PRG);
411
412 if (mmc_host_is_spi(card->host)) {
413 if (status & R1_SPI_ILLEGAL_COMMAND)
414 return -EBADMSG;
415 } else {
416 if (status & 0xFDFFA000)
417 printk(KERN_WARNING "%s: unexpected status %#x after "
418 "switch", mmc_hostname(card->host), status);
419 if (status & R1_SWITCH_ERROR)
420 return -EBADMSG;
421 }
422
423 return 0;
424}
425EXPORT_SYMBOL_GPL(mmc_switch);
426
427int mmc_send_status(struct mmc_card *card, u32 *status)
428{
429 int err;
430 struct mmc_command cmd = {0};
431
432 BUG_ON(!card);
433 BUG_ON(!card->host);
434
435 cmd.opcode = MMC_SEND_STATUS;
436 if (!mmc_host_is_spi(card->host))
437 cmd.arg = card->rca << 16;
438 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
439
440 err = mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
441 if (err)
442 return err;
443
444 /* NOTE: callers are required to understand the difference
445 * between "native" and SPI format status words!
446 */
447 if (status)
448 *status = cmd.resp[0];
449
450 return 0;
451}
452
453static int
454mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
455 u8 len)
456{
457 struct mmc_request mrq = {0};
458 struct mmc_command cmd = {0};
459 struct mmc_data data = {0};
460 struct scatterlist sg;
461 u8 *data_buf;
462 u8 *test_buf;
463 int i, err;
464 static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
465 static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
466
467 /* dma onto stack is unsafe/nonportable, but callers to this
468 * routine normally provide temporary on-stack buffers ...
469 */
470 data_buf = kmalloc(len, GFP_KERNEL);
471 if (!data_buf)
472 return -ENOMEM;
473
474 if (len == 8)
475 test_buf = testdata_8bit;
476 else if (len == 4)
477 test_buf = testdata_4bit;
478 else {
479 printk(KERN_ERR "%s: Invalid bus_width %d\n",
480 mmc_hostname(host), len);
481 kfree(data_buf);
482 return -EINVAL;
483 }
484
485 if (opcode == MMC_BUS_TEST_W)
486 memcpy(data_buf, test_buf, len);
487
488 mrq.cmd = &cmd;
489 mrq.data = &data;
490 cmd.opcode = opcode;
491 cmd.arg = 0;
492
493 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
494 * rely on callers to never use this with "native" calls for reading
495 * CSD or CID. Native versions of those commands use the R2 type,
496 * not R1 plus a data block.
497 */
498 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
499
500 data.blksz = len;
501 data.blocks = 1;
502 if (opcode == MMC_BUS_TEST_R)
503 data.flags = MMC_DATA_READ;
504 else
505 data.flags = MMC_DATA_WRITE;
506
507 data.sg = &sg;
508 data.sg_len = 1;
509 sg_init_one(&sg, data_buf, len);
510 mmc_wait_for_req(host, &mrq);
511 err = 0;
512 if (opcode == MMC_BUS_TEST_R) {
513 for (i = 0; i < len / 4; i++)
514 if ((test_buf[i] ^ data_buf[i]) != 0xff) {
515 err = -EIO;
516 break;
517 }
518 }
519 kfree(data_buf);
520
521 if (cmd.error)
522 return cmd.error;
523 if (data.error)
524 return data.error;
525
526 return err;
527}
528
529int mmc_bus_test(struct mmc_card *card, u8 bus_width)
530{
531 int err, width;
532
533 if (bus_width == MMC_BUS_WIDTH_8)
534 width = 8;
535 else if (bus_width == MMC_BUS_WIDTH_4)
536 width = 4;
537 else if (bus_width == MMC_BUS_WIDTH_1)
538 return 0; /* no need for test */
539 else
540 return -EINVAL;
541
542 /*
543 * Ignore errors from BUS_TEST_W. BUS_TEST_R will fail if there
544 * is a problem. This improves chances that the test will work.
545 */
546 mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
547 err = mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
548 return err;
549}
1/*
2 * linux/drivers/mmc/core/mmc_ops.h
3 *
4 * Copyright 2006-2007 Pierre Ossman
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
10 */
11
12#include <linux/slab.h>
13#include <linux/export.h>
14#include <linux/types.h>
15#include <linux/scatterlist.h>
16
17#include <linux/mmc/host.h>
18#include <linux/mmc/card.h>
19#include <linux/mmc/mmc.h>
20
21#include "core.h"
22#include "card.h"
23#include "host.h"
24#include "mmc_ops.h"
25
26#define MMC_OPS_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
27
28static const u8 tuning_blk_pattern_4bit[] = {
29 0xff, 0x0f, 0xff, 0x00, 0xff, 0xcc, 0xc3, 0xcc,
30 0xc3, 0x3c, 0xcc, 0xff, 0xfe, 0xff, 0xfe, 0xef,
31 0xff, 0xdf, 0xff, 0xdd, 0xff, 0xfb, 0xff, 0xfb,
32 0xbf, 0xff, 0x7f, 0xff, 0x77, 0xf7, 0xbd, 0xef,
33 0xff, 0xf0, 0xff, 0xf0, 0x0f, 0xfc, 0xcc, 0x3c,
34 0xcc, 0x33, 0xcc, 0xcf, 0xff, 0xef, 0xff, 0xee,
35 0xff, 0xfd, 0xff, 0xfd, 0xdf, 0xff, 0xbf, 0xff,
36 0xbb, 0xff, 0xf7, 0xff, 0xf7, 0x7f, 0x7b, 0xde,
37};
38
39static const u8 tuning_blk_pattern_8bit[] = {
40 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00,
41 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc, 0xcc,
42 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff, 0xff,
43 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee, 0xff,
44 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd, 0xdd,
45 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff, 0xbb,
46 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff, 0xff,
47 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee, 0xff,
48 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
49 0x00, 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc,
50 0xcc, 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff,
51 0xff, 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee,
52 0xff, 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd,
53 0xdd, 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff,
54 0xbb, 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff,
55 0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee,
56};
57
58int __mmc_send_status(struct mmc_card *card, u32 *status, unsigned int retries)
59{
60 int err;
61 struct mmc_command cmd = {};
62
63 cmd.opcode = MMC_SEND_STATUS;
64 if (!mmc_host_is_spi(card->host))
65 cmd.arg = card->rca << 16;
66 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
67
68 err = mmc_wait_for_cmd(card->host, &cmd, retries);
69 if (err)
70 return err;
71
72 /* NOTE: callers are required to understand the difference
73 * between "native" and SPI format status words!
74 */
75 if (status)
76 *status = cmd.resp[0];
77
78 return 0;
79}
80EXPORT_SYMBOL_GPL(__mmc_send_status);
81
82int mmc_send_status(struct mmc_card *card, u32 *status)
83{
84 return __mmc_send_status(card, status, MMC_CMD_RETRIES);
85}
86EXPORT_SYMBOL_GPL(mmc_send_status);
87
88static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
89{
90 struct mmc_command cmd = {};
91
92 cmd.opcode = MMC_SELECT_CARD;
93
94 if (card) {
95 cmd.arg = card->rca << 16;
96 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
97 } else {
98 cmd.arg = 0;
99 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
100 }
101
102 return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
103}
104
105int mmc_select_card(struct mmc_card *card)
106{
107
108 return _mmc_select_card(card->host, card);
109}
110
111int mmc_deselect_cards(struct mmc_host *host)
112{
113 return _mmc_select_card(host, NULL);
114}
115
116/*
117 * Write the value specified in the device tree or board code into the optional
118 * 16 bit Driver Stage Register. This can be used to tune raise/fall times and
119 * drive strength of the DAT and CMD outputs. The actual meaning of a given
120 * value is hardware dependant.
121 * The presence of the DSR register can be determined from the CSD register,
122 * bit 76.
123 */
124int mmc_set_dsr(struct mmc_host *host)
125{
126 struct mmc_command cmd = {};
127
128 cmd.opcode = MMC_SET_DSR;
129
130 cmd.arg = (host->dsr << 16) | 0xffff;
131 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
132
133 return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
134}
135
136int mmc_go_idle(struct mmc_host *host)
137{
138 int err;
139 struct mmc_command cmd = {};
140
141 /*
142 * Non-SPI hosts need to prevent chipselect going active during
143 * GO_IDLE; that would put chips into SPI mode. Remind them of
144 * that in case of hardware that won't pull up DAT3/nCS otherwise.
145 *
146 * SPI hosts ignore ios.chip_select; it's managed according to
147 * rules that must accommodate non-MMC slaves which this layer
148 * won't even know about.
149 */
150 if (!mmc_host_is_spi(host)) {
151 mmc_set_chip_select(host, MMC_CS_HIGH);
152 mmc_delay(1);
153 }
154
155 cmd.opcode = MMC_GO_IDLE_STATE;
156 cmd.arg = 0;
157 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
158
159 err = mmc_wait_for_cmd(host, &cmd, 0);
160
161 mmc_delay(1);
162
163 if (!mmc_host_is_spi(host)) {
164 mmc_set_chip_select(host, MMC_CS_DONTCARE);
165 mmc_delay(1);
166 }
167
168 host->use_spi_crc = 0;
169
170 return err;
171}
172
173int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
174{
175 struct mmc_command cmd = {};
176 int i, err = 0;
177
178 cmd.opcode = MMC_SEND_OP_COND;
179 cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
180 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
181
182 for (i = 100; i; i--) {
183 err = mmc_wait_for_cmd(host, &cmd, 0);
184 if (err)
185 break;
186
187 /* if we're just probing, do a single pass */
188 if (ocr == 0)
189 break;
190
191 /* otherwise wait until reset completes */
192 if (mmc_host_is_spi(host)) {
193 if (!(cmd.resp[0] & R1_SPI_IDLE))
194 break;
195 } else {
196 if (cmd.resp[0] & MMC_CARD_BUSY)
197 break;
198 }
199
200 err = -ETIMEDOUT;
201
202 mmc_delay(10);
203 }
204
205 if (rocr && !mmc_host_is_spi(host))
206 *rocr = cmd.resp[0];
207
208 return err;
209}
210
211int mmc_set_relative_addr(struct mmc_card *card)
212{
213 struct mmc_command cmd = {};
214
215 cmd.opcode = MMC_SET_RELATIVE_ADDR;
216 cmd.arg = card->rca << 16;
217 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
218
219 return mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
220}
221
222static int
223mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
224{
225 int err;
226 struct mmc_command cmd = {};
227
228 cmd.opcode = opcode;
229 cmd.arg = arg;
230 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
231
232 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
233 if (err)
234 return err;
235
236 memcpy(cxd, cmd.resp, sizeof(u32) * 4);
237
238 return 0;
239}
240
241/*
242 * NOTE: void *buf, caller for the buf is required to use DMA-capable
243 * buffer or on-stack buffer (with some overhead in callee).
244 */
245static int
246mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
247 u32 opcode, void *buf, unsigned len)
248{
249 struct mmc_request mrq = {};
250 struct mmc_command cmd = {};
251 struct mmc_data data = {};
252 struct scatterlist sg;
253
254 mrq.cmd = &cmd;
255 mrq.data = &data;
256
257 cmd.opcode = opcode;
258 cmd.arg = 0;
259
260 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
261 * rely on callers to never use this with "native" calls for reading
262 * CSD or CID. Native versions of those commands use the R2 type,
263 * not R1 plus a data block.
264 */
265 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
266
267 data.blksz = len;
268 data.blocks = 1;
269 data.flags = MMC_DATA_READ;
270 data.sg = &sg;
271 data.sg_len = 1;
272
273 sg_init_one(&sg, buf, len);
274
275 if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
276 /*
277 * The spec states that CSR and CID accesses have a timeout
278 * of 64 clock cycles.
279 */
280 data.timeout_ns = 0;
281 data.timeout_clks = 64;
282 } else
283 mmc_set_data_timeout(&data, card);
284
285 mmc_wait_for_req(host, &mrq);
286
287 if (cmd.error)
288 return cmd.error;
289 if (data.error)
290 return data.error;
291
292 return 0;
293}
294
295static int mmc_spi_send_csd(struct mmc_card *card, u32 *csd)
296{
297 int ret, i;
298 __be32 *csd_tmp;
299
300 csd_tmp = kzalloc(16, GFP_KERNEL);
301 if (!csd_tmp)
302 return -ENOMEM;
303
304 ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd_tmp, 16);
305 if (ret)
306 goto err;
307
308 for (i = 0; i < 4; i++)
309 csd[i] = be32_to_cpu(csd_tmp[i]);
310
311err:
312 kfree(csd_tmp);
313 return ret;
314}
315
316int mmc_send_csd(struct mmc_card *card, u32 *csd)
317{
318 if (mmc_host_is_spi(card->host))
319 return mmc_spi_send_csd(card, csd);
320
321 return mmc_send_cxd_native(card->host, card->rca << 16, csd,
322 MMC_SEND_CSD);
323}
324
325static int mmc_spi_send_cid(struct mmc_host *host, u32 *cid)
326{
327 int ret, i;
328 __be32 *cid_tmp;
329
330 cid_tmp = kzalloc(16, GFP_KERNEL);
331 if (!cid_tmp)
332 return -ENOMEM;
333
334 ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid_tmp, 16);
335 if (ret)
336 goto err;
337
338 for (i = 0; i < 4; i++)
339 cid[i] = be32_to_cpu(cid_tmp[i]);
340
341err:
342 kfree(cid_tmp);
343 return ret;
344}
345
346int mmc_send_cid(struct mmc_host *host, u32 *cid)
347{
348 if (mmc_host_is_spi(host))
349 return mmc_spi_send_cid(host, cid);
350
351 return mmc_send_cxd_native(host, 0, cid, MMC_ALL_SEND_CID);
352}
353
354int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
355{
356 int err;
357 u8 *ext_csd;
358
359 if (!card || !new_ext_csd)
360 return -EINVAL;
361
362 if (!mmc_can_ext_csd(card))
363 return -EOPNOTSUPP;
364
365 /*
366 * As the ext_csd is so large and mostly unused, we don't store the
367 * raw block in mmc_card.
368 */
369 ext_csd = kzalloc(512, GFP_KERNEL);
370 if (!ext_csd)
371 return -ENOMEM;
372
373 err = mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD, ext_csd,
374 512);
375 if (err)
376 kfree(ext_csd);
377 else
378 *new_ext_csd = ext_csd;
379
380 return err;
381}
382EXPORT_SYMBOL_GPL(mmc_get_ext_csd);
383
384int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
385{
386 struct mmc_command cmd = {};
387 int err;
388
389 cmd.opcode = MMC_SPI_READ_OCR;
390 cmd.arg = highcap ? (1 << 30) : 0;
391 cmd.flags = MMC_RSP_SPI_R3;
392
393 err = mmc_wait_for_cmd(host, &cmd, 0);
394
395 *ocrp = cmd.resp[1];
396 return err;
397}
398
399int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
400{
401 struct mmc_command cmd = {};
402 int err;
403
404 cmd.opcode = MMC_SPI_CRC_ON_OFF;
405 cmd.flags = MMC_RSP_SPI_R1;
406 cmd.arg = use_crc;
407
408 err = mmc_wait_for_cmd(host, &cmd, 0);
409 if (!err)
410 host->use_spi_crc = use_crc;
411 return err;
412}
413
414static int mmc_switch_status_error(struct mmc_host *host, u32 status)
415{
416 if (mmc_host_is_spi(host)) {
417 if (status & R1_SPI_ILLEGAL_COMMAND)
418 return -EBADMSG;
419 } else {
420 if (status & 0xFDFFA000)
421 pr_warn("%s: unexpected status %#x after switch\n",
422 mmc_hostname(host), status);
423 if (status & R1_SWITCH_ERROR)
424 return -EBADMSG;
425 }
426 return 0;
427}
428
429/* Caller must hold re-tuning */
430int __mmc_switch_status(struct mmc_card *card, bool crc_err_fatal)
431{
432 u32 status;
433 int err;
434
435 err = mmc_send_status(card, &status);
436 if (!crc_err_fatal && err == -EILSEQ)
437 return 0;
438 if (err)
439 return err;
440
441 return mmc_switch_status_error(card->host, status);
442}
443
444int mmc_switch_status(struct mmc_card *card)
445{
446 return __mmc_switch_status(card, true);
447}
448
449static int mmc_poll_for_busy(struct mmc_card *card, unsigned int timeout_ms,
450 bool send_status, bool retry_crc_err)
451{
452 struct mmc_host *host = card->host;
453 int err;
454 unsigned long timeout;
455 u32 status = 0;
456 bool expired = false;
457 bool busy = false;
458
459 /* We have an unspecified cmd timeout, use the fallback value. */
460 if (!timeout_ms)
461 timeout_ms = MMC_OPS_TIMEOUT_MS;
462
463 /*
464 * In cases when not allowed to poll by using CMD13 or because we aren't
465 * capable of polling by using ->card_busy(), then rely on waiting the
466 * stated timeout to be sufficient.
467 */
468 if (!send_status && !host->ops->card_busy) {
469 mmc_delay(timeout_ms);
470 return 0;
471 }
472
473 timeout = jiffies + msecs_to_jiffies(timeout_ms) + 1;
474 do {
475 /*
476 * Due to the possibility of being preempted while polling,
477 * check the expiration time first.
478 */
479 expired = time_after(jiffies, timeout);
480
481 if (host->ops->card_busy) {
482 busy = host->ops->card_busy(host);
483 } else {
484 err = mmc_send_status(card, &status);
485 if (retry_crc_err && err == -EILSEQ) {
486 busy = true;
487 } else if (err) {
488 return err;
489 } else {
490 err = mmc_switch_status_error(host, status);
491 if (err)
492 return err;
493 busy = R1_CURRENT_STATE(status) == R1_STATE_PRG;
494 }
495 }
496
497 /* Timeout if the device still remains busy. */
498 if (expired && busy) {
499 pr_err("%s: Card stuck being busy! %s\n",
500 mmc_hostname(host), __func__);
501 return -ETIMEDOUT;
502 }
503 } while (busy);
504
505 return 0;
506}
507
508/**
509 * __mmc_switch - modify EXT_CSD register
510 * @card: the MMC card associated with the data transfer
511 * @set: cmd set values
512 * @index: EXT_CSD register index
513 * @value: value to program into EXT_CSD register
514 * @timeout_ms: timeout (ms) for operation performed by register write,
515 * timeout of zero implies maximum possible timeout
516 * @timing: new timing to change to
517 * @use_busy_signal: use the busy signal as response type
518 * @send_status: send status cmd to poll for busy
519 * @retry_crc_err: retry when CRC errors when polling with CMD13 for busy
520 *
521 * Modifies the EXT_CSD register for selected card.
522 */
523int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
524 unsigned int timeout_ms, unsigned char timing,
525 bool use_busy_signal, bool send_status, bool retry_crc_err)
526{
527 struct mmc_host *host = card->host;
528 int err;
529 struct mmc_command cmd = {};
530 bool use_r1b_resp = use_busy_signal;
531 unsigned char old_timing = host->ios.timing;
532
533 mmc_retune_hold(host);
534
535 /*
536 * If the cmd timeout and the max_busy_timeout of the host are both
537 * specified, let's validate them. A failure means we need to prevent
538 * the host from doing hw busy detection, which is done by converting
539 * to a R1 response instead of a R1B.
540 */
541 if (timeout_ms && host->max_busy_timeout &&
542 (timeout_ms > host->max_busy_timeout))
543 use_r1b_resp = false;
544
545 cmd.opcode = MMC_SWITCH;
546 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
547 (index << 16) |
548 (value << 8) |
549 set;
550 cmd.flags = MMC_CMD_AC;
551 if (use_r1b_resp) {
552 cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
553 /*
554 * A busy_timeout of zero means the host can decide to use
555 * whatever value it finds suitable.
556 */
557 cmd.busy_timeout = timeout_ms;
558 } else {
559 cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
560 }
561
562 if (index == EXT_CSD_SANITIZE_START)
563 cmd.sanitize_busy = true;
564
565 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
566 if (err)
567 goto out;
568
569 /* No need to check card status in case of unblocking command */
570 if (!use_busy_signal)
571 goto out;
572
573 /*If SPI or used HW busy detection above, then we don't need to poll. */
574 if (((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp) ||
575 mmc_host_is_spi(host))
576 goto out_tim;
577
578 /* Let's try to poll to find out when the command is completed. */
579 err = mmc_poll_for_busy(card, timeout_ms, send_status, retry_crc_err);
580 if (err)
581 goto out;
582
583out_tim:
584 /* Switch to new timing before check switch status. */
585 if (timing)
586 mmc_set_timing(host, timing);
587
588 if (send_status) {
589 err = mmc_switch_status(card);
590 if (err && timing)
591 mmc_set_timing(host, old_timing);
592 }
593out:
594 mmc_retune_release(host);
595
596 return err;
597}
598
599int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
600 unsigned int timeout_ms)
601{
602 return __mmc_switch(card, set, index, value, timeout_ms, 0,
603 true, true, false);
604}
605EXPORT_SYMBOL_GPL(mmc_switch);
606
607int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error)
608{
609 struct mmc_request mrq = {};
610 struct mmc_command cmd = {};
611 struct mmc_data data = {};
612 struct scatterlist sg;
613 struct mmc_ios *ios = &host->ios;
614 const u8 *tuning_block_pattern;
615 int size, err = 0;
616 u8 *data_buf;
617
618 if (ios->bus_width == MMC_BUS_WIDTH_8) {
619 tuning_block_pattern = tuning_blk_pattern_8bit;
620 size = sizeof(tuning_blk_pattern_8bit);
621 } else if (ios->bus_width == MMC_BUS_WIDTH_4) {
622 tuning_block_pattern = tuning_blk_pattern_4bit;
623 size = sizeof(tuning_blk_pattern_4bit);
624 } else
625 return -EINVAL;
626
627 data_buf = kzalloc(size, GFP_KERNEL);
628 if (!data_buf)
629 return -ENOMEM;
630
631 mrq.cmd = &cmd;
632 mrq.data = &data;
633
634 cmd.opcode = opcode;
635 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
636
637 data.blksz = size;
638 data.blocks = 1;
639 data.flags = MMC_DATA_READ;
640
641 /*
642 * According to the tuning specs, Tuning process
643 * is normally shorter 40 executions of CMD19,
644 * and timeout value should be shorter than 150 ms
645 */
646 data.timeout_ns = 150 * NSEC_PER_MSEC;
647
648 data.sg = &sg;
649 data.sg_len = 1;
650 sg_init_one(&sg, data_buf, size);
651
652 mmc_wait_for_req(host, &mrq);
653
654 if (cmd_error)
655 *cmd_error = cmd.error;
656
657 if (cmd.error) {
658 err = cmd.error;
659 goto out;
660 }
661
662 if (data.error) {
663 err = data.error;
664 goto out;
665 }
666
667 if (memcmp(data_buf, tuning_block_pattern, size))
668 err = -EIO;
669
670out:
671 kfree(data_buf);
672 return err;
673}
674EXPORT_SYMBOL_GPL(mmc_send_tuning);
675
676int mmc_abort_tuning(struct mmc_host *host, u32 opcode)
677{
678 struct mmc_command cmd = {};
679
680 /*
681 * eMMC specification specifies that CMD12 can be used to stop a tuning
682 * command, but SD specification does not, so do nothing unless it is
683 * eMMC.
684 */
685 if (opcode != MMC_SEND_TUNING_BLOCK_HS200)
686 return 0;
687
688 cmd.opcode = MMC_STOP_TRANSMISSION;
689 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
690
691 /*
692 * For drivers that override R1 to R1b, set an arbitrary timeout based
693 * on the tuning timeout i.e. 150ms.
694 */
695 cmd.busy_timeout = 150;
696
697 return mmc_wait_for_cmd(host, &cmd, 0);
698}
699EXPORT_SYMBOL_GPL(mmc_abort_tuning);
700
701static int
702mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
703 u8 len)
704{
705 struct mmc_request mrq = {};
706 struct mmc_command cmd = {};
707 struct mmc_data data = {};
708 struct scatterlist sg;
709 u8 *data_buf;
710 u8 *test_buf;
711 int i, err;
712 static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
713 static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
714
715 /* dma onto stack is unsafe/nonportable, but callers to this
716 * routine normally provide temporary on-stack buffers ...
717 */
718 data_buf = kmalloc(len, GFP_KERNEL);
719 if (!data_buf)
720 return -ENOMEM;
721
722 if (len == 8)
723 test_buf = testdata_8bit;
724 else if (len == 4)
725 test_buf = testdata_4bit;
726 else {
727 pr_err("%s: Invalid bus_width %d\n",
728 mmc_hostname(host), len);
729 kfree(data_buf);
730 return -EINVAL;
731 }
732
733 if (opcode == MMC_BUS_TEST_W)
734 memcpy(data_buf, test_buf, len);
735
736 mrq.cmd = &cmd;
737 mrq.data = &data;
738 cmd.opcode = opcode;
739 cmd.arg = 0;
740
741 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
742 * rely on callers to never use this with "native" calls for reading
743 * CSD or CID. Native versions of those commands use the R2 type,
744 * not R1 plus a data block.
745 */
746 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
747
748 data.blksz = len;
749 data.blocks = 1;
750 if (opcode == MMC_BUS_TEST_R)
751 data.flags = MMC_DATA_READ;
752 else
753 data.flags = MMC_DATA_WRITE;
754
755 data.sg = &sg;
756 data.sg_len = 1;
757 mmc_set_data_timeout(&data, card);
758 sg_init_one(&sg, data_buf, len);
759 mmc_wait_for_req(host, &mrq);
760 err = 0;
761 if (opcode == MMC_BUS_TEST_R) {
762 for (i = 0; i < len / 4; i++)
763 if ((test_buf[i] ^ data_buf[i]) != 0xff) {
764 err = -EIO;
765 break;
766 }
767 }
768 kfree(data_buf);
769
770 if (cmd.error)
771 return cmd.error;
772 if (data.error)
773 return data.error;
774
775 return err;
776}
777
778int mmc_bus_test(struct mmc_card *card, u8 bus_width)
779{
780 int width;
781
782 if (bus_width == MMC_BUS_WIDTH_8)
783 width = 8;
784 else if (bus_width == MMC_BUS_WIDTH_4)
785 width = 4;
786 else if (bus_width == MMC_BUS_WIDTH_1)
787 return 0; /* no need for test */
788 else
789 return -EINVAL;
790
791 /*
792 * Ignore errors from BUS_TEST_W. BUS_TEST_R will fail if there
793 * is a problem. This improves chances that the test will work.
794 */
795 mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
796 return mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
797}
798
799static int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
800{
801 struct mmc_command cmd = {};
802 unsigned int opcode;
803 int err;
804
805 if (!card->ext_csd.hpi) {
806 pr_warn("%s: Card didn't support HPI command\n",
807 mmc_hostname(card->host));
808 return -EINVAL;
809 }
810
811 opcode = card->ext_csd.hpi_cmd;
812 if (opcode == MMC_STOP_TRANSMISSION)
813 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
814 else if (opcode == MMC_SEND_STATUS)
815 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
816
817 cmd.opcode = opcode;
818 cmd.arg = card->rca << 16 | 1;
819
820 err = mmc_wait_for_cmd(card->host, &cmd, 0);
821 if (err) {
822 pr_warn("%s: error %d interrupting operation. "
823 "HPI command response %#x\n", mmc_hostname(card->host),
824 err, cmd.resp[0]);
825 return err;
826 }
827 if (status)
828 *status = cmd.resp[0];
829
830 return 0;
831}
832
833/**
834 * mmc_interrupt_hpi - Issue for High priority Interrupt
835 * @card: the MMC card associated with the HPI transfer
836 *
837 * Issued High Priority Interrupt, and check for card status
838 * until out-of prg-state.
839 */
840int mmc_interrupt_hpi(struct mmc_card *card)
841{
842 int err;
843 u32 status;
844 unsigned long prg_wait;
845
846 if (!card->ext_csd.hpi_en) {
847 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
848 return 1;
849 }
850
851 err = mmc_send_status(card, &status);
852 if (err) {
853 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
854 goto out;
855 }
856
857 switch (R1_CURRENT_STATE(status)) {
858 case R1_STATE_IDLE:
859 case R1_STATE_READY:
860 case R1_STATE_STBY:
861 case R1_STATE_TRAN:
862 /*
863 * In idle and transfer states, HPI is not needed and the caller
864 * can issue the next intended command immediately
865 */
866 goto out;
867 case R1_STATE_PRG:
868 break;
869 default:
870 /* In all other states, it's illegal to issue HPI */
871 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
872 mmc_hostname(card->host), R1_CURRENT_STATE(status));
873 err = -EINVAL;
874 goto out;
875 }
876
877 err = mmc_send_hpi_cmd(card, &status);
878 if (err)
879 goto out;
880
881 prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
882 do {
883 err = mmc_send_status(card, &status);
884
885 if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
886 break;
887 if (time_after(jiffies, prg_wait))
888 err = -ETIMEDOUT;
889 } while (!err);
890
891out:
892 return err;
893}
894
895int mmc_can_ext_csd(struct mmc_card *card)
896{
897 return (card && card->csd.mmca_vsn > CSD_SPEC_VER_3);
898}
899
900/**
901 * mmc_stop_bkops - stop ongoing BKOPS
902 * @card: MMC card to check BKOPS
903 *
904 * Send HPI command to stop ongoing background operations to
905 * allow rapid servicing of foreground operations, e.g. read/
906 * writes. Wait until the card comes out of the programming state
907 * to avoid errors in servicing read/write requests.
908 */
909int mmc_stop_bkops(struct mmc_card *card)
910{
911 int err = 0;
912
913 err = mmc_interrupt_hpi(card);
914
915 /*
916 * If err is EINVAL, we can't issue an HPI.
917 * It should complete the BKOPS.
918 */
919 if (!err || (err == -EINVAL)) {
920 mmc_card_clr_doing_bkops(card);
921 mmc_retune_release(card->host);
922 err = 0;
923 }
924
925 return err;
926}
927
928static int mmc_read_bkops_status(struct mmc_card *card)
929{
930 int err;
931 u8 *ext_csd;
932
933 err = mmc_get_ext_csd(card, &ext_csd);
934 if (err)
935 return err;
936
937 card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
938 card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
939 kfree(ext_csd);
940 return 0;
941}
942
943/**
944 * mmc_start_bkops - start BKOPS for supported cards
945 * @card: MMC card to start BKOPS
946 * @from_exception: A flag to indicate if this function was
947 * called due to an exception raised by the card
948 *
949 * Start background operations whenever requested.
950 * When the urgent BKOPS bit is set in a R1 command response
951 * then background operations should be started immediately.
952*/
953void mmc_start_bkops(struct mmc_card *card, bool from_exception)
954{
955 int err;
956 int timeout;
957 bool use_busy_signal;
958
959 if (!card->ext_csd.man_bkops_en || mmc_card_doing_bkops(card))
960 return;
961
962 err = mmc_read_bkops_status(card);
963 if (err) {
964 pr_err("%s: Failed to read bkops status: %d\n",
965 mmc_hostname(card->host), err);
966 return;
967 }
968
969 if (!card->ext_csd.raw_bkops_status)
970 return;
971
972 if (card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2 &&
973 from_exception)
974 return;
975
976 if (card->ext_csd.raw_bkops_status >= EXT_CSD_BKOPS_LEVEL_2) {
977 timeout = MMC_OPS_TIMEOUT_MS;
978 use_busy_signal = true;
979 } else {
980 timeout = 0;
981 use_busy_signal = false;
982 }
983
984 mmc_retune_hold(card->host);
985
986 err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
987 EXT_CSD_BKOPS_START, 1, timeout, 0,
988 use_busy_signal, true, false);
989 if (err) {
990 pr_warn("%s: Error %d starting bkops\n",
991 mmc_hostname(card->host), err);
992 mmc_retune_release(card->host);
993 return;
994 }
995
996 /*
997 * For urgent bkops status (LEVEL_2 and more)
998 * bkops executed synchronously, otherwise
999 * the operation is in progress
1000 */
1001 if (!use_busy_signal)
1002 mmc_card_set_doing_bkops(card);
1003 else
1004 mmc_retune_release(card->host);
1005}
1006EXPORT_SYMBOL(mmc_start_bkops);
1007
1008/*
1009 * Flush the cache to the non-volatile storage.
1010 */
1011int mmc_flush_cache(struct mmc_card *card)
1012{
1013 int err = 0;
1014
1015 if (mmc_card_mmc(card) &&
1016 (card->ext_csd.cache_size > 0) &&
1017 (card->ext_csd.cache_ctrl & 1)) {
1018 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1019 EXT_CSD_FLUSH_CACHE, 1, 0);
1020 if (err)
1021 pr_err("%s: cache flush error %d\n",
1022 mmc_hostname(card->host), err);
1023 }
1024
1025 return err;
1026}
1027EXPORT_SYMBOL(mmc_flush_cache);
1028
1029static int mmc_cmdq_switch(struct mmc_card *card, bool enable)
1030{
1031 u8 val = enable ? EXT_CSD_CMDQ_MODE_ENABLED : 0;
1032 int err;
1033
1034 if (!card->ext_csd.cmdq_support)
1035 return -EOPNOTSUPP;
1036
1037 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_CMDQ_MODE_EN,
1038 val, card->ext_csd.generic_cmd6_time);
1039 if (!err)
1040 card->ext_csd.cmdq_en = enable;
1041
1042 return err;
1043}
1044
1045int mmc_cmdq_enable(struct mmc_card *card)
1046{
1047 return mmc_cmdq_switch(card, true);
1048}
1049EXPORT_SYMBOL_GPL(mmc_cmdq_enable);
1050
1051int mmc_cmdq_disable(struct mmc_card *card)
1052{
1053 return mmc_cmdq_switch(card, false);
1054}
1055EXPORT_SYMBOL_GPL(mmc_cmdq_disable);